|
| |
|
|
A130593
|
|
Evil semiprimes.
|
|
2
| |
|
|
6, 9, 10, 15, 33, 34, 39, 46, 51, 57, 58, 65, 77, 85, 86, 95, 106, 111, 119, 123, 129, 141, 142, 159, 166, 169, 177, 178, 183, 187, 201, 202, 209, 215, 219, 221, 226, 235, 237, 249, 267
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| Products of two (not necessarily distinct) primes such that the product has an even number of 1's in its binary expansion. Non-evil semiprimes are odious (A000069).
|
|
|
LINKS
| Harvey P. Dale, Table of n, a(n) for n = 1..1000
|
|
|
FORMULA
| A001358 INTERSECTION A001969.
|
|
|
MATHEMATICA
| Select[Range[300], PrimeOmega[#]==2&&EvenQ[DigitCount[#, 2, 1]]&] (* From Harvey P. Dale, Nov 08 2011 *)
|
|
|
CROSSREFS
| Cf. A000069, A001358, A001969.
Sequence in context: A020219 A175634 A134622 * A051221 A029843 A000729
Adjacent sequences: A130590 A130591 A130592 * A130594 A130595 A130596
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), Jun 16 2007
|
|
|
EXTENSIONS
| Corrected (a(21)=129 added) by Harvey P. Dale, Nov 08 2011
|
| |
|
|
